The Bucket Brigade

Inside the Boss HA-5 headphone guitar amplifier from 1983. It had built in chorus and delay effects. The chorus came from the Boss CE-3 guitar pedal and used the Matsushita/Panasonic MN3207 Bucket Brigade Device and the accompanying MN3102 clock generator chip. The NEC IC on the left is an analog compander device i.e. it compresses and expands the input audio signal.
The Bucket Brigade concept, developed by Philips Research Labs, had a series of on-chip capacitors between which charges moved in sequence, based on an external clock cycle. It was a precursor to the Charge Coupled Device (CCD) that was developed as the first significant semiconductor image sensor.

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